矿业科学学报2025，Vol.10Issue(5)：923-935,13.DOI:10.19606/j.cnki.jmst.2025080
界面裂隙倾角对岩-煤组合体力学特性影响试验研究
Experimental study on effects of interfacial crack angle on mechanical properties of rock-coal composite sample
摘要
Abstract
To investigate the influence of interfacial crack angle on the mechanical properties of coal-rock composite samples,uniaxial compression tests were conducted on samples with interface crack an-gles α(the angle between the interface crack and vertical direction)of 0°,15°,30°,60°,75°,and 90°.Combined with acoustic emission system and XTDIC three-dimensional full-field strain measure-ment system,the characteristics of characteristic stress,deformation and failure characteristics,and energy evolution of rock-coal composite samples with interfacial crack were studied.under axial stress,the fractured zones within the coal sample are more prone to developing stress concentrations,leading to crack initiation and propagation.As α increases,the crack initiation stress and damage stress of the composite specimen gradually decrease.Interfacial crack facilitate the initiation,development,and propagation of internal cracks within composite samples,thereby weakening their overall load-bearing capacity.With the increase of α,the pre-peak elastic energy density of the composite sample gradually decreases,and the uniaxial compressive strength and elastic modulus of the sample show a decreasing trend.The propagation and coalescence of internal cracks in coal and rock samples lead to the failure of composite samples.With the increase of α,the macroscopic failure mode transitions from a tensile-shear mixed mode accompanied by localized ejection failure to one predominantly characterized by tensile fail-ure,with a gradual decrease in post-peak surplus energy density.Concurrently,the failure of coal sam-ple leads to the rebound deformation of rock sample,and with the increase of α,both the magnitude and rate of rebound deformation in the rock sample progressively rise.关键词
岩-煤组合体/界面裂隙/能量演化/变形破坏特征/裂纹扩展Key words
rock-coal composite samples/interfacial cracks/energy evolution/deformation and failure characteristics/crack propagation分类
矿山工程引用本文复制引用
韩磊,尹大伟,余振宇,许起,秦宇鹏..界面裂隙倾角对岩-煤组合体力学特性影响试验研究[J].矿业科学学报,2025,10(5):923-935,13.基金项目
国家自然科学基金(52274128,52574153) （52274128,52574153）
泰山学者工程专项经费(tsqn202306199) （tsqn202306199）
